According to the power calculation 106 patients will be randomized. The total duration of the study is 18 months. Starting with a run-in visit, each eligible patient is observed in the naturalistic run-in phase for four weeks. Subsequently, patients participate 100 days in the clinical trial starting with a baseline visit, an in between-visit and a final visit. Medical care is provided in the routine program of both study centres. To record the adherence, medication events are counted by Medication Event Monitoring System (MEMS).